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measuring strabismus. The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]
Prism correction. Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
Comparison of photo stitching software. Photo stitching software turns several shots into one more or less smooth image. Photo stitching software produce panoramic pictures and VR photographs. The other method involves using panoramic cameras or panoramic mirror lenses (i.e. one-shot lenses ).
Most colour correction filters are somewhat more accurately identified by a code of the form CCaab, e.g. CC50Y – CC for colour correction, aa = 50 for the strength of the filter (50%), and b = Y for yellow.
Other lower-order aberrations are non- visually significant aberrations known as first order aberrations, such as prisms and zero-order aberrations (piston). Low order aberrations account for approximately 90% of the overall wave aberration in the eye.
With optimal spherical correction, the letters on the red and green halves of the chart appear equally clear. Because this test is based on chromatic aberration and not on color discrimination, it is used even with people having color vision deficiency .